Abstract

A number of dipodand dications and tetracations were synthesised with structures based on 1,2,4,5-, penta- and hexa-substituted benzene, DABCO substituents providing the positive charges. The binding of these polycations in water to a variety of polyanions was examined with respect to the effect of the 'spectator' counter cations on the observed association constants. The polycations precipitate ferri- and ferrocyanide, in some cases preferentially for one oxidation state, and an X-ray crystallographic analysis of the complex between the tetracation 5 and ferricyanide reveals the complexity involved even in the molecular recognition of small, charged compounds. (C) 2000 Elsevier Science Ltd.

Type:

Article

Title:

Molecular design using electrostatic interactions. Part 2: Synthesis and properties of flexible dipodand di- and tetra-cations with restricted conformations. Charge, shape and size in molecular complexation